#include <stdio.h>
#include <string.h>

#define MAX_LEN 100

int main(int argc, char *argv[])
{
    char cmd[MAX_LEN];
    while(1)
    {
        scanf("%s", cmd);
        if(0 == strcmp(cmd, "help"))
        {
            printf("This is help command.\n");
        }
        else if(0 == strcmp(cmd, "q") || 0 == strcmp(cmd, "Q") || 0 == strcmp(cmd, "quit"))
        {
            break;
        }
        else
        {
            printf("Unknown command!\n");
        }
    }

    return 0;
}
